49er fans lined the visitor side of the stadium to root on their team Sunday January 12, 2014. The San Francisco 49ers beat the Carolina Panthers 23-10 in Charlotte, North Carolina to advance to the NFC title game against Seattle.

Photo: Brant Ward, The Chronicle

49er fans lined the visitor side of the stadium to root on their...

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San Francisco 49ers fan Pedro Torrales poses outside the stadium prior to the NFC Divisional Playoff Game against the Carolina Panthers at Bank of America Stadium on January 12, 2014 in Charlotte, North Carolina.

Photo: Ronald Martinez, Getty Images

San Francisco 49ers fan Pedro Torrales poses outside the stadium...

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Two fans, Tony Langley (right) and his friend Ronnie watched the 49ers warm up Sunday January 12, 2014. The San Francisco 49ers take on the Carolina Panthers in a divisional playoff game at Bank of America stadium in Charlotte, North Carolina.

The good feelings between the 49ers and Seahawks simply could not last.

Last week, fans from both teams decided to donate money to children's hospitals in Seattle and San Francisco. Now, the Seahawks are limiting ticket sales to six states and the Canadian provinces.

Only credit cards with addresses from Oregon, Washington, Montana, Idaho, Alaska and Hawaii will be allowed to buy tickets to Sunday's NFC Championship Game between the 49ers and Seahawks at CenturyLink Field in Seattle. That's it.

California is not on the list.

The move will give ticket preference to Seahawks fans and, the team hopes, eliminate scalpers.

Niners fans are known for traveling. This season, 49ers fans made their presence known in several opposing stadiums, and 49ers play-by-play announcer Ted Robinson said Sunday there were droves of San Francisco fans in Charlotte, N.C., for the 49ers' 23-10 win.

The restriction means 49ers fans will have to go to the secondary market to buy tickets. According to CBS Sports, the cheapest seats are going for $330.